Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 91: 2D materials beyond graphene: TMDCs, silicene and relatives III
O 91.4: Talk
Thursday, March 15, 2018, 11:15–11:30, MA 043
Structural and electronic characterization of sulfur depleted monolayer VS2 synthesized on Au(111) — •Umut Kamber1, Fabian Arnold2, Brian Kiraly1, Raluca-Maria Stan2, Arlette Sohanfo Ngankeu2, Marco Bianchi2, Jill Miwa2, Charlotte Sanders2, Philip Hofmann2, and Alexander Ako Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 2Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark
Studies on bulk transition metal dichalcogenides (TMDCs) show a variety of electronic properties based on the specific combination of metal and chalcogen elements. Since it is possible to exfoliate or synthesize stable 2D versions of many TMDCs, they have attracted great attention for the opportunity to study reduced dimensionality in a variety of electronic systems. VS2 is of particular interest, as it has not yet been synthesized in monolayer form, and its magnetic ground state is unclear. Here, we present an investigation with low temperature scanning tunneling microscopy/spectroscopy (STM/STS) on the structural and electronic properties of sulfur-depleted single layer VS2 on Au(111). Upon annealing as grown 1T monolayer VS2, there is a structural phase transition to a sulfur depleted phase of VS2, which exhibits reconstructed chain-like structures. Our results shed light on the atomic structure of single layer VS2 as well as reveal a complex Fermi surface of striped phase. STS mapping at low temperature indicates the emergence of non-dispersive electronic ordering close to the Fermi level.